I spent the afternoon (about 6 hours) at the Maritime Museum in San Diego. The most interesting pieces of their collection was a Foxtrot Soviet attack submarine and a US scientific submarine (holds the record for deepest dive). There were a few other ships to walk through, including a ferry with a huge steam engine.
The picture above was taken through the periscope of the US submarine.
If you are wondering about why I took a picture of this… It’s the ‘head’ or toilet.